From 3f97e021b2cf41ac95aa41ab8ba5e60f5b0eb39b Mon Sep 17 00:00:00 2001
From: NishiOwO <nishi@nishi.boats>
Date: Sat, 11 Oct 2025 16:22:20 +0000
Subject: [PATCH] works on gdi too

git-svn-id: http://svn2.nishi.boats/svn/milsko/trunk@279 b9cfdab3-6d41-4d17-bbe4-086880011989
---
 include/Mw/LowLevel.h  |  8 +++++---
 src/backend/gdi.c      | 14 ++++++++++++++
 src/backend/x11.c      |  8 ++++++++
 src/widget/scrollbar.c | 24 +++++++++++++++++++++++-
 4 files changed, 50 insertions(+), 4 deletions(-)

diff --git a/include/Mw/LowLevel.h b/include/Mw/LowLevel.h
index 0af1415..3d83a89 100644
--- a/include/Mw/LowLevel.h
+++ b/include/Mw/LowLevel.h
@@ -46,9 +46,11 @@ enum MwLLKeyEnum {
 };
 
 enum MwLLMouseEnum {
-	MwLLMouseLeft	= 1,
-	MwLLMouseMiddle = 2,
-	MwLLMouseRight	= 3
+	MwLLMouseLeft = 1,
+	MwLLMouseMiddle,
+	MwLLMouseRight,
+	MwLLMouseWheelUp,
+	MwLLMouseWheelDown
 };
 
 struct _MwLLMouse {
diff --git a/src/backend/gdi.c b/src/backend/gdi.c
index 6252d4d..d24373e 100644
--- a/src/backend/gdi.c
+++ b/src/backend/gdi.c
@@ -72,6 +72,20 @@ static LRESULT CALLBACK wndproc(HWND hWnd, UINT msg, WPARAM wp, LPARAM lp) {
 
 		SetCapture(NULL);
 		MwLLDispatch(u->ll, up, &p);
+	} else if(msg == WM_MOUSEWHEEL) {
+		int	  d = GET_WHEEL_DELTA_WPARAM(wp);
+		MwLLMouse p;
+		p.point.x = LOWORD(lp);
+		p.point.y = HIWORD(lp);
+
+		if(d > 0) {
+			p.button = MwLLMouseWheelUp;
+		} else if(d < 0) {
+			p.button = MwLLMouseWheelDown;
+		}
+
+		MwLLDispatch(u->ll, down, &p);
+		MwLLDispatch(u->ll, up, &p);
 	} else if(msg == WM_MOUSEMOVE) {
 		MwPoint p;
 		p.x = LOWORD(lp);
diff --git a/src/backend/x11.c b/src/backend/x11.c
index d685a12..b5fbb83 100644
--- a/src/backend/x11.c
+++ b/src/backend/x11.c
@@ -172,6 +172,10 @@ void MwLLNextEvent(MwLL handle) {
 				p.button = MwLLMouseMiddle;
 			} else if(ev.xbutton.button == Button3) {
 				p.button = MwLLMouseRight;
+			} else if(ev.xbutton.button == Button4) {
+				p.button = MwLLMouseWheelUp;
+			} else if(ev.xbutton.button == Button5) {
+				p.button = MwLLMouseWheelDown;
 			}
 
 			MwLLDispatch(handle, down, &p);
@@ -187,6 +191,10 @@ void MwLLNextEvent(MwLL handle) {
 				p.button = MwLLMouseMiddle;
 			} else if(ev.xbutton.button == Button3) {
 				p.button = MwLLMouseRight;
+			} else if(ev.xbutton.button == Button4) {
+				p.button = MwLLMouseWheelUp;
+			} else if(ev.xbutton.button == Button5) {
+				p.button = MwLLMouseWheelDown;
 			}
 
 			MwLLDispatch(handle, up, &p);
diff --git a/src/widget/scrollbar.c b/src/widget/scrollbar.c
index c2514cf..5f615a9 100644
--- a/src/widget/scrollbar.c
+++ b/src/widget/scrollbar.c
@@ -164,8 +164,30 @@ static void mouse_down(MwWidget handle, void* ptr) {
 	int	     wh	 = MwGetInteger(handle, MwNheight);
 	int	     or	 = MwGetInteger(handle, MwNorientation);
 	scrollbar_t* scr = handle->internal;
+	MwLLMouse*   m	 = ptr;
 
-	if(((MwLLMouse*)ptr)->button != MwLLMouseLeft) return;
+	if(m->button == MwLLMouseWheelUp) {
+		int min = MwGetInteger(handle, MwNminValue);
+		int val = MwGetInteger(handle, MwNvalue);
+
+		val -= MwGetInteger(handle, MwNareaShown);
+
+		if(val < min) val = min;
+
+		MwSetInteger(handle, MwNvalue, val);
+		MwDispatchUserHandler(handle, MwNchangedHandler, NULL);
+	} else if(m->button == MwLLMouseWheelDown) {
+		int max = MwGetInteger(handle, MwNmaxValue);
+		int val = MwGetInteger(handle, MwNvalue);
+
+		val += MwGetInteger(handle, MwNareaShown);
+
+		if(val > max) val = max;
+
+		MwSetInteger(handle, MwNvalue, val);
+		MwDispatchUserHandler(handle, MwNchangedHandler, NULL);
+	}
+	if(m->button != MwLLMouseLeft) return;
 
 	scr->point = handle->mouse_point;
 	scr->drag  = 0;